This report describes a field test performed at Hallsta Paper Mill in Sweden using the newly developed SPM®HD method. The method has been applied to four twin wire presses from Andritz running at low speed. The approximate RPM range is 8 to 16. The field test started late April 2009 and is continuing to this day. To download the full case study by Tim Sundström, R&D, SPM Instrument AB, click below